Web replenishing means



June 25, 1940. w. c. sco'rT 2,205,867

WEB REPLENISHING MEANS Filed Nev. 27, 1937 5 Sheets-Sheet 1 I INVENTOR mATTORNEY June 25, 1940. w, c, sco -2,205,867

WEB REPLENI SHING MEANS Filed Nov. 27, 1937 5 Sheets-Sheet 2 ATTORNEY W.c. SCOTT 2,205,867

WEB REBLENISHING MEANS Filed Nov. 27, 1937 I 15 Sheets-Sheet 5 INVENTORMile] (3 Jmlf ATTORNEY June 25, 1940. w. c. SCOTT 2,205,867

WEB REPLENISHING MEANS Filed Nov. 27, 1957 5 Sheets-Sheet 4 INVENTORfiager f Jmi/ v ATTORNEY W. C. SCOTT WEB REPLENISHING MEANS 5Sheets-Sheet 5 Filed Nov. 27, 1937 H mw w a l xv m mw mm \L v Q 4 N Qw IQ a n w INVENTOR Jim 6 Jaw/f BY W ATTORNEY Patented June 25, 1940 UNITEDSTATES PATENT OFFICE 18' Claims.

This invention relates generally to web replenishing or web splicingmechanism in which a rotatable replenishing web roll is provided with apasted portion and has its speed of rotation accelerated to unitingspeed before it is united by its pasted portion to a running web. Morespecifically it relates to the class of devices in which a shield isrotated at the same speed as the roll and serves to protect the pastedportion thereof while the roll is brought up to the desired speed, saidshield being thereafter rel-eased from its driving means and retarded tothereby expose said pasted portion, the paster being made while the rollcontinues its rotation.

The problem of releasing the shield from its driving connection andstopping it is a serious one and I have found that brakes for retardingthe shield will not operate satisfactorily because the speed attained bythe shield at the moment of its release will vary and therefore thebrakes will be called upon to meet different operating conditions withthe result that the retardatio of the shield becomes non-uniform.

The main object and feature of this invention 25 is to make the speed ofdeceleration of the shield proportional to the speed of rotation of theweb rolL-the higher the speed of the roll the greater the speed ofdeceleration of the shield and the slower the speed of the roll the lessthe speed of deceleration of the shield, the device thus beingself-compensating, as it were.

The invention can best be understood in connection with the accompanyingdrawings in which the invention is clothed in several forms, 35 and inwhich:

Fig. l is a view in side elevation with partsbroken away and in sectionof a web supply mechanism embodying one form of the inven-' tion;

Fig. 2 is a sectional View substantially on the plane of line 2-2 ofFig. 1, with parts shown in elevation;

Fig. 3 is an enlarged sectional view of the left-hand end of Fig. 2, butshowing the parts at a different moment in the cycle of operations;

Fig. 4 is a diagrammatic view showing relation of the elements of avariable transmission means employed in connection with my invention;and

Figs. 5 and 6 disclose a modified form of invention, Fig. 5 beingsomewhat diagrammatic and showing the mechanism associated with one ofthe three rolls usually employed, and Fig. 6 being a sectional viewsubstantially on the plane of line 66 of Fig. 5.

A conventional form of roll stand I0 is disclosed in Figs. 1 and 2, saidroll stand having a rotatable shaft II to which spiders i2 are keyed atopposite ends thereof. Each of the spiders here consists of a hubportion 13 and three arms 5 it, each set of opposed arms carrying a webroll designated here for convenience as active roll I5, replenishingroll l6 and reserve roll ll. l8 indicates the running web leading fromtheactive roll to a web-pulling machine such as a printing machine intowhich the running web is threaded.

i9 indicates a pasted portion on the leading end of the web of thereplenishing roll, and such pasted portion can be a part of the webitself or may consist of tabs applied thereto, and it may be continuouslengthwise of the roll or interrupted in accordance with differentstandard practices employed in the art. 20 is a shield, arranged in theinstant form of the invention to extend throughout the length of the webroll, said shield being preferably supported closely adjacent to but outof contact with the surface of the web roll, so as not to mar thesurface of the roll, by means of. shield arms 2|. The width of the webto be supplied will vary with the requirements of the printing machineand can, for instance, be two, three or four pages wide depending uponthe character of the product desired; and the shield, if it is to coverthe entire 30 field of the pasted portion of the web, is therefore madeadjustable and this is here. accomplished by having two slidably relatedoverlapping or telescoping members 22 and 23 so that, when spiders i2are adjusted on shaft ii to sup- 35 I port the desired width of web, thelength of the shield will be automatically adjusted. So likewise, thediameter of web rolls vary and, in order to support the shield in properrelation to the surface thereof, shield arms 2| are composed of twomembers 24 and 25 that are slidably related by slots 26 and bolts 21 sothat the shield can be supported at a greater or lesser distanceradially from the center of rotation of the roll. As will be seen fromFig. l, the contour of the shield 5 circumierentially of the roll ispreferably arcshape with taper ends 28 so as to avoid a too abrupttransition of the accelerating means, in this form of the inventionrunning web I8, from the surface of the roll to the shield and vice 50versa.

The means that support web roll 16 may take the form of a continuouscore shaft or, as here shown, two core members 29 and 3|] are employed.Core member 29. has a short spindle 3| 5 of oscillation of crank 42.

rotatably mounted in spider arm I l and shield arm 2| is loosely mountedon said spindle 3|; core member 35 has a somewhat longer spindle orshaft 32 mounted in the spider arm it opposite to that which supportsspindle 3!, and the other shield arm 2! is loosely mounted on said shaft32.

Suitable means are provided to move the shield in unison with core shaft32, to release it therefrom and to thereafter retard said shield bydriving it at a gradually decelerating speed to bring it substantiallyto a stop. In the present instance these means take the following form:keyed to vcore shaft 32 is a clutch member 33 having openings 34 for thereception of pins 35 carried by sliclable clutch member 36, whichlatteris loosely mounted on shaft 32. Hub 3'! of shield arm 2! is loose oncore-shaft 32 but is provided with openings 33'with which pins 35 arealways in engagement so that whatever rotative movement is imparted toclutch member 36 will betransmitted to shield arm 2!. It will now beunderstood that, when clutch member 36 is moved to the right (in Fig.3), pins 35 will engage openings'ini of clutch member 33 and that theseinstrumentalities constitute connectable and disconnectable means todrive the shield from coreshaft 32 and in unison therewith. Carriedloose- :ly on 'core-shaft'32 is a transmission member 39 and keyed toshaft 22 is a slidable clutch membe r M! the purpose of which is tocouple or uncouple member 39 to and from shaft 32. Member 39 carries acrank M and, when said mem- ;ber is coupled to shaft 32, crank M willmake one revolution to each rotation of shaft 32;

42 in dicates asecond crank secured to rockshaft 43 carried by spiderarm M, and M is a connecting rod pivotally connected to cranks ll andas. as is a controller in the form of a gear, hav- 'ing a rising andfalling speed, loosely mounted on shaft 32 and oscillated by suitabletransmission be manipulated, and 53 is a lever pivoted at 55 for movingclutch member into and out of engagement with 39. is an actuating leverpivoted at 56 and designed to be moved by cam fill on clutch 36 to causepin 55a to engage and lift upper end of lever 53 to uncouple clutch 40from 39. The short end of lever 55, carrying pin f 55a, is normallyurged downward either by being made heavier than the long end or by theaction of a spring 551).

Before proceeding to describe the operation of the device, it will bewell to study the interrelation of the two cranks 4| and i2 and themanner in which they are articulated, that is, their relative length,their position circumferentially with respect to each other and thelength of connecting rod M that extends between them. Reference will nowbe had to Fig. 4 in which A indicates the center of rotation of shaft ormember ,32 and therefore also the center of rotation of crank ii; italso designates the-center of oscillation of controller 45. B indicatesthe center When transmission member 38 is clutched or coupled to shaft32, crank ll makes one revolution to each revolution of said shaft andof the web roll supported by it. Crank 4| is relatively short ascompared with the length of crank 42, crank 52 being in the presentinstance twice as long as 4|. The

result is that a complete rotation of crank M will not cause a completerotation of crank 42 but will oscillate the latter, which oscillatingmovement is in turn transmitted to controller i5. But also, theoscillating movement of crank 62, and therefore of controller 25, willnot be uniform as to speed but will be rising and falling going fromzero to high speed and then back to Zero. The full lines of il, 2 and Min Fig. 4 indicate the high speed position of crank 42. Now it will beevident that deceleration of the shield should be accomplished in lessthan one revolution of "shaft 32 because, after the shield has passedthe point of contact with running web E5 or other accelerating device,and it is desired to effect the paster, the shield should not again comein contact with said running web or other accelerating device. Also itwill be apparent that the transfer of the control of the shield fromshaft 32 to controller should be effected at a time when said controlleris moving at substantially the same speed as the shield and thatnecessarily requires that crank d2 shall at that moment be moving at itshighest speed, and that sufficient time must be allowed in which tobring said crank 42 up to full speed. For the purpose of making thisclear, let us trace the movement of crank (62 during its movement in onedirection only.

The dot and dash position of M, 42 and i indicates the position of theparts at zero or at the beginning of the movement of crank 22 in onedirection. As will be observed, the parts are so articulated that, atthat moment, connecting rod i l lies parallel to crank M and overliesthe lat--v ter. Movement of crank il from point-'0, in the directionindicated by the arrow will now gradually accelerate the movement ofcrank 32 until point I) is reached. During this time crank d2 has movedfrom point x to point y and is new traveling at its highest speed.Continued movement of crank iii from point I) now imparts a deceleratingmovement to crank d2 until point e is reached. When crank' li reachespoint 0, crank 22 'is at point 2 which is the zero point at which nomotion or very little motion takes place. The position of the parts atthis moment is indicated by the dotted lines, and it will be observedthat connecting rod d4 now forms a straight-line extension of crank lContinued rotation of crank ii will now reverse the movement of crank 32and will cause it to move in the other direction until crank it againreaches point a. During its movement from point a to point e, crank (Hhas traveled somewhat more than one hundred eighty degrees, that is,slightly more than one-- half of a revolution of shaft 32, and crank 32in traveling from a: to a has moved somewhat more than forty-fivedegrees. However, the period during which the shield has beendecelerated is represented by the travel of crank M from b to c which inthis instance is somewhat less than ninety degrees of revolution ofshaft 32. It is not intended by the foregoing to convey the impressionthat the relative length and circumferential positionof the two cranksand the length of the connecting rod herein disclosed must necessarilybe used, but the relationship shown has been found convenient andeffective for the purpose indicated. To sum up the matter: the train ofelements from is to Q5 constitutes a timed driv-' ing means in which isincluded a variable speed mechanism, here the two connected cranks, forgradually retarding or decelerating the shield after it is released frommember 32.

The operation of the device is as follows: before starting accelerationof the wab roll, clutch 36 is moved to the right in Fig. 3 therebybringing pins 35 into openings 34 thus connecting the shield to shaft32. This movement also serves to move cam 57 away from actuating lever55 and as the short end of 55 is heavier than the long end or is movedby a spring 55b it drops away from lever 53 thereby permitting clutch itto engage member 39 thereby coupling said member to shaft 32.Themovement of clutch l-t can be effected by hand or springs (not shown)can be utilized to effect this movement automatically when 53 isreleased by 55. The web roll is now accelerated either by running web l8or other means, and the shield being connected to shaft 32 will move inunison with the roll and protect the pasted portion thereof. Rotation ofshaft 32 will also rotate crank 45 in unison with the roll and crank d2will oscillate thereby oscillating controller 45 which latter is mountedloosely on shaft 32.. When the roll has attained uniting speed, clutch36 is moved to the left when recess t9 and tooth are opposite to eachother, thereby releasing the shield from shaft 32 and connecting it tocontroller 45. This happens at the moment when controller s5 istraveling at its highest speed, that is: when crank 42 is at the point yin Fig. .4, and the transfer of the control of the shield from 32 to 45is therefore elfected without shock. The speed of crank ill now beginsto decelerate and when it is substantially at zero, point a, Fig. 4, cam5'! will have moved to a position where it will contact lever 55 and.cause the latter to throw out clutch 45 thereby preventing continuedrotation of crank ll and consequently preventing continued movement ofcontroller 45. It is not necessary that this action take placeabsolutely at zero; it may occur slightly before or slightly after crankA 2 reaches this point so that when clutch it! is thrown out the partsmay still have a slight movement which however is soon brought to an endby the inertia of the parts. The important point is that the speed ofdeceleration is always proportional to the speed of the web roll, andthat the shield is controlled at all times. As the web roll continuesits rotation the paster will be effected in a manner well understood inthe art.

In Figs. 5 and 6 is shown a modification in which gears =35, t5 and s?are replaced by two oscillating cranks 58 and 59 here of equal length,and a connecting rod 69, crank 58 becoming the equivalent of controller45. Cranks ti and 42 are shown in the zero position as are cranks 58 andDuring the time that crank t! travels approximately one hundred eightydegrees from the position shown, cranks 42, 53 and 59 travel in thisinstance approximately ninety degrees from zero to the other zeroposition indicated in dash dot lines. The middle of the stroke or highspeed position of cranks d2, 58 and 59 is indicated in dotted lines. Itis not intended to convey that the relative length and circumferentialposition of the cranks shown need be followed, it is merely one instanceof an effective arrangement that may be used. The operation of thismodified form is in all essentials the same as that de scribed inconnection with the form shown in Figs. 1 to 4 inclusive.

I claim:

. 1. In a web replenishing mechanism in which a. rotatable web rollisprovided with a pasted portion and has its speed of rotationaccelerated to uniting speed before it is united by its pasted portionto a running web, a member driven in unison with the web roll; arotatable shield connected to said member to travel in unison therewithand to protect the pasted portion of the web roll during acceleration ofthe speed of rotation of said roll; means to release said rotatableshield from said member; driving means timed to move in unison with saidmember; and connections, including variable speed mechanism, from saiddriving means and connectable to said shield unison with the webroll; arotatable shield con-;

nected to said member to travel in unison therewith and to protect thepasted portion of the web roll during acceleration of the speed ofrotation of said roll; means to release said rotatable shield from tomove in unison with said member; and connections, including a pair ofcranks, from said driving means and connectable to said shield to retardthe shield, after said shield has been released from celerating speedthat is proportional to the speed at which said member moves.

. In aweb replenishing machanism in which a rotatable web roll isprovided with a pasted portion has its speed of rotation accelerated touniting speed before it is united by its pasted portion to a runningweb, a member driven in unison with the web roll; a rotatable shieldcon-- nected to said member to travel in unison therewith and to protectthe pasted portion of the web .roll during acceleration of the speed ofrotation of said roll; means to release said rotatable shield from saidmember; driving means timed to move in unison with said member; andconnections,

including two connected cranks one rotatable andthe other oscillatory,from said driving means and connectable to said shield to retard theshield, after said shield has been released from said member, at agradually decelerating speed that is proportional to the speed at whichsaid memb er moves.

4. In a web replenishing mechanism in which a rotatable web roll isprovided with a pasted portion and has its speed of rotation acceleratedto uniting speed before it is united by its pasted portion to a runningweb, a member driven in unison with the web roll; a rotatable shieldconnected to said member to travel in unison therevith and to protectthe pasted portion of the web roll during acceleration of the speed ofrotation of said roll; means to release said rotatable shield from saidmember; driving means timed to move in unison with said member; andconnections, including two connected cranks one relatively short androtatable and the other relatively long and oscillatory, from saiddriving means and connectable to said shield to retard the shield, aftersaid shield has been released from said member, at a graduallydecelerating speed that is proportional to the speed at which saidmember moves.

5. In a web replenishing mechanism in which a rotatable web roll isprovided with a pasted por tion and has its speed of rotationaccelerated to uniting speed before it is united by its pasted saidmember; driving means, timed,

said member, at a gradually de-.

portion to a running web, a member driven in unison with the web roll; arotatable shield to cover the pasted portion of the web roll duringacceleration of the speed of rotation of said roll; connectable anddisconnectable driving means to drive the shield in unison with saidmember during acceleration of the speed of rotation of said web roll;driving means connectable and disconnectableto and from said member; andconnections, including a variable-speed transmission mechanism, fromsaid driving means and connectable to said shield to retard said shield,after said shield has been released from said member, during less thanone revolution of the web roll, at a gradually decelerating speed tothereby bring the shield substantially to a state of rest and to exposethe pasted portion of the web roll while said roll continues itsrotation.

6. In a web replenishing mechanism in which a rotatable web roll isprovided with a pasted portion and has its speed of rotation acceleratedto uniting speed before it is united by its pasted portion to a runningweb, a member driven in unison with the web roll; a rotatable shield,driven from and in unison with said member, to cover the pasted portionof the web roll during acceleration of the speed of rotation of saidroll; a controller having a rising and falling speed; means to releasesaid shield from said member and to connect it to said controllersubstantially at the moment when the speed of said controller is equalto the speed of the shield; connections, including a variable-speedmechanism, driven by said member and driving the controller; and adevice to disconnect said connections from said member substantially atthe moment when the speed of the controller is at zero.

'7. In a web replenishing mechanism in which a rotatable web rollisprovided with a pasted portion and has its speed of rotation acceleratedto uniting speed before it is united by its pasted portion to a runningweb, a rotatable support for the web roll, driven by rotation of the webroll; a shield loosely mounted on said support to cover the pastedportion of the web roll during acceleration of the speed of rotation oisaid web roll; connecting means to drive the shield from and in unisonwith the rotatable support; a controller having a rising and fallingspeed; connecting means to drive the shield from and in unison with thecontroller; a rotatable transmission element mounted on the rotatablesupport; a device to connect or disconnect the transmission element withrespect to the rotatable support; a variable-speed transmissionmechanism from said rotatable transmission element to said controller;and means to automatically actuate said device to disconnect thetransmission element from the rotatable support a predetermined periodafter the shield has been connected to the controller.

8. In a web replenishing mechanism in which a rotatable web roll isprovided with a pasted portion and has its speed of rotation acceleratedto uniting speed before it is united by its pasted portion to a runningweb, a member driven in unison with the web, roll; a. rotatable shield,driven from and in unison with said member, to cover the pasted portionof the web roll during acceleration oi the speed of rotation of saidroll; an oscillatory controller having a rising and falling speed; meansto release said shield from said member and to connect it to saidcontroller substantially at the moment when the speed of said controlleris equal to the speed of the shield; connections, including avariable-speed mechanism, driven by said member and oscillating thecontroller; and a device to disconnect said connections from said membersubstantially at the moment when the speed of zero.

9. In a web replenishing mechanism in which a rotatable web roll isprovided with a pasted portion and has its speed of rotation acceleratedto uniting speed before it is united by its pasted portion to a runningweb, a rotatable support for the web roll, driven by rotation. of theweb roll; a shield loosely mounted on said support to cover the pastedportion of the web roll during acceleration of the speed of rotation ofsaid 15 web roll; connecting means to drive the shield from and inunison with the rotatable support; an oscillatory controllerha-ving arising and falling speed; connecting means to drive the shield from andin unison with the controller; a rotatable transmission element mountedon the rotatable support; a device to connect or disconnect thetransmission element with respect to the rotatable support; avariable-speed transmission mechanism from said rotatable transmissionelement to said controller to oscillate the latter; and means toautomatically actuate said device todisconnect the transmission elementfrom the rotatable support a predetermined period after the shield hasbeen connected to the controller.

10. In a web replenshing mechanism in which a rotatable web roll isprovided with a pasted portion and has its speed of rotation acceleratedto uniting speed before it is united by its pasted portion to a runningweb, a member driven in unison with the web roll; a rotatable shield tocover the pasted portion of the web roll during acceleration of thespeed of rotation of said roll; connectable and disconnectable drivingmeans to drive the shield in unison with said member dur ingacceleration of the speed of rotation of said web roll; driving meansconnectable and disccnnectable to and from said member; and connections,from said driving means and connectable to said shield, including a pairof cranks so 45 articulated as to retard said shield, during less thanone revolution of the web roll, at a gradually decelerating speed tothereby bring the shield substantially to a state of rest and to exposethe pasted portion or" the roll while said roll con- .5

tinues its rotation.

11. In a web replenishing mechanism in which a rotatable Web roll isprovided with a pasted portion and has its speed of rotationaccelerated.

to uniting speed before it is united by its pasted portion to a runningweb, a member driven in unison with the web roll; a rotatable shield,driven from and in unison with said member, to cover the pasted portionof the web roll during acceleration of the speed of rotation of saidroll; 6

a controller having a rising and falling speed; means to release saidshield from said member and to connect it to said controllersubstantially at the moment when the speed of said controller is equalto the speed of the shield; connections e including a pair of cranks,driven by said member and driving the controller; and a device todisconnect said connections from said member substantially at the momentwhen the speed of the controller is at zero.

12. In a web replenishing mechanism in which a rotatable Web roll isprovided with a pasted portion and has its speed of rotation acceleratedto uniting speed before it is united by its pasted portion to a runningweb, a rotatable support 1 the controller is at 5 for the Web roll,driven by rotation of the web roll; a shield loosely mounted on saidsupport to cover the pasted portion of the web roll during accelerationof the speed of rotation of said Web roll; connecting means to drive theshield from and in unison with the rotatable support; a controllerhaving a rising and falling speed; connecting means to drive the shieldfrom and in unison with the controller; a rotatable transmission elementmounted on the rotatable support; a device to connect or disconnect thetransmission element with respect to the rotatable support; connectionsincluding a variable-speed transmission mechanism consisting in part ofa pair of cranks extending from said rotatable transmission element tosaid controller; and means to automatically actuate said device todisconnect the transmission element from the rotatable support apredetermined period after the shield has been connected to thecontroller.

13. In a web replenshing mechanism in which a rotatable web roll isprovided with a pasted portion and has its speed of rotation,accelerated to uniting speed before it is united by its pasted portionto a running web, a member driven in unison with the web roll; arotatable shield, driven from and in unison with said member, to coverthe pasted portion of the web roll during acceleration of the speed ofrotation of said roll; an oscillatory controller having a rising andfalling speed; means to release said shield from said member and toconnect it to said controller substantially at the moment when the speedof said controller is equal to the speed of the shield; connections,including a paid of cranks, driven by said member and oscillating thecontroller; and a device to disconnect said connections from said membersubstantially at the moment when the speed of the controller is at Zero.

14. In a web replenishing mechanism in which a rotatable web roll isprovided with a pasted portion and has its speed of rotation acceleratedto uniting speed before it is united by its pasted portion to a runningweb, a rotatable support for the web roll, driven by rotation of the webroll; a shield loosely mounted on said support to cover the pastedportion of the web roll during acceleration of the speed of rotation ofsaid web roll; connecting means to drive the shield from and in unisonwith the rotatable support; an oscillatory controller having a risingand falling speed; connecting means to drive the shield from and inunison with the controller; a rotatable transmission element mounted onthe rotatable support; a device to connect or disconnect thetransmission element with respect to the rotatable support; connectionsincluding a variable-speed transmission mechanism consisting in part ofa pair of' cranks extending from said rotatable transmission element tosaid controller to oscillate the latter; and means to automaticallyactuate said device to disconnect the transmission element from therotatable support a predetermined period after the shield has beenconnected to the controller.

15. In a web replenishing mechanism in which a rotatable web roll isprovided with a pasted portion and has its speed of rotation acceleratedto uniting speed before it is united by its pasted portion to a runningweb, a member driven in unison with the web roll; a rotatable shield tocover the pasted portion of the web roll during acceleration of thespeed of rotation of said roll; connectable and disconnectable drivingmeans to drive the shield in unison with said member during accelerationof the speed of rotation of said web roll; driving means connectable anddisconnectable to and from said member; and connections, from saiddriving means and connectable to said shield, including two connectedcranks one rotatable and the other oscillatory, to retard said shield,during less than one revolution of the web roll, at a graduallydecelerating speed to thereby bring the shield-substantially to a stateof rest and to expose the pasted portion of the roll while said rollcontinues its rotation.

16. In a web replenishing mechanism in which a rotatable web roll isprovided with a pasted portion and has its speed of rotation acceleratedto uniting speed before it is united by its pasted portion to a runningweb, a member driven in unison with the web roll; a rotatable shield tocover the pasted portion of the web roll during acceleration of thespeed of rotation of said roll; connectable and disconnectable drivingmeans to drive the shield in unison with said member during accelerationof the speed of rotation of said web roll; driving means connectable anddisconnectable to and from said member; and connections, from drivingmeans and connectable to said shield, including two connected cranks onerelatively short and rotatable and the other relatively long andoscillatory, to retard said shield, during less than one revolution ofthe web roll, at a gradually decelerating speed to thereby bring theshield substantially to a state of rest and to expose the pasted portionof the roll while said roll continues its rotation.

17. In a web replenishing mechanism in which a rotatable web roll isprovided with a pasted portion and has its speed of rotation acceleratedto uniting speed before it is united by its pasted portion to a runningweb, a member driven in unison with the web roll; a rotatable shield toprotect the pasted portion of the web roll during acceleration of thespeed of rotation of said roll; carrying means connected to said memberto travel in unison therewith and to sustain said shield out of contactwith the surface of the roll; means to release said carrying means fromsaid member; and means to decelerate the carrying means after it isreleased from said member.

18. In a web replenishing mechanism in which a rotatable web roll isprovided with a pasted portion and has its speed of rotation acceleratedto uniting speed before it is united by its pasted portion to a runningweb, a member driven in unison with the web roll; a rotatable shield, toprotect the pasted portion of the web roll during acceleration of thespeed of rotation of said roll, composed of slidably related members toincrease or decrease its length to accommodate it to different widths ofweb rolls; carrying means connected to said member to travel in unisontherewith to sustain said slidably related shield members out of contactwith the surface of the roll; means to release said carrying means fromsaid member; and means to decelerate the carrying means after it isreleased from said member.

WALTER C. SCOTT.

